How does CBD oil affect your stutter?

How does CBD oil affect your stutter? One of my friends who is a PwS says it has helped him (and also his dad & uncle who stutter) and that his doctor prescribes it to him. It is quite expensive though so unsure if I am willing to spend so much on something that may not work, as money is a bit tight at the moment. [View Poll](https://www.reddit.com/poll/10ewxha)